1 | // Copyright (C) 2011 Tim Blechmann |
---|---|
2 | // |
3 | // Distributed under the Boost Software License, Version 1.0. (See |
4 | // accompanying file LICENSE_1_0.txt or copy at |
5 | // http://www.boost.org/LICENSE_1_0.txt) |
6 | |
7 | #ifndef BOOST_LOCKFREE_TEST_HELPERS |
8 | #define BOOST_LOCKFREE_TEST_HELPERS |
9 | |
10 | #include <set> |
11 | #include <boost/array.hpp> |
12 | #include <boost/lockfree/detail/atomic.hpp> |
13 | #include <boost/thread.hpp> |
14 | |
15 | #include <boost/cstdint.hpp> |
16 | |
17 | template <typename int_type> |
18 | int_type generate_id(void) |
19 | { |
20 | static boost::lockfree::detail::atomic<int_type> generator(0); |
21 | return ++generator; |
22 | } |
23 | |
24 | template <typename int_type, size_t buckets> |
25 | class static_hashed_set |
26 | { |
27 | |
28 | public: |
29 | int calc_index(int_type id) |
30 | { |
31 | // knuth hash ... does not need to be good, but has to be portable |
32 | size_t factor = size_t((float)buckets * 1.616f); |
33 | |
34 | return ((size_t)id * factor) % buckets; |
35 | } |
36 | |
37 | bool insert(int_type const & id) |
38 | { |
39 | std::size_t index = calc_index(id); |
40 | |
41 | boost::lock_guard<boost::mutex> lock (ref_mutex[index]); |
42 | |
43 | std::pair<typename std::set<int_type>::iterator, bool> p; |
44 | p = data[index].insert(id); |
45 | |
46 | return p.second; |
47 | } |
48 | |
49 | bool find (int_type const & id) |
50 | { |
51 | std::size_t index = calc_index(id); |
52 | |
53 | boost::lock_guard<boost::mutex> lock (ref_mutex[index]); |
54 | |
55 | return data[index].find(id) != data[index].end(); |
56 | } |
57 | |
58 | bool erase(int_type const & id) |
59 | { |
60 | std::size_t index = calc_index(id); |
61 | |
62 | boost::lock_guard<boost::mutex> lock (ref_mutex[index]); |
63 | |
64 | if (data[index].find(id) != data[index].end()) { |
65 | data[index].erase(id); |
66 | assert(data[index].find(id) == data[index].end()); |
67 | return true; |
68 | } |
69 | else |
70 | return false; |
71 | } |
72 | |
73 | std::size_t count_nodes(void) const |
74 | { |
75 | std::size_t ret = 0; |
76 | for (int i = 0; i != buckets; ++i) { |
77 | boost::lock_guard<boost::mutex> lock (ref_mutex[i]); |
78 | ret += data[i].size(); |
79 | } |
80 | return ret; |
81 | } |
82 | |
83 | private: |
84 | boost::array<std::set<int_type>, buckets> data; |
85 | mutable boost::array<boost::mutex, buckets> ref_mutex; |
86 | }; |
87 | |
88 | struct test_equal |
89 | { |
90 | test_equal(int i): |
91 | i(i) |
92 | {} |
93 | |
94 | void operator()(int arg) const |
95 | { |
96 | BOOST_REQUIRE_EQUAL(arg, i); |
97 | } |
98 | |
99 | int i; |
100 | }; |
101 | |
102 | struct dummy_functor |
103 | { |
104 | void operator()(int /* arg */) const |
105 | { |
106 | } |
107 | }; |
108 | |
109 | |
110 | #endif |
111 |